CVE-2026-57855: Cockpit CMS Missing Authorization in Bucket File Storage API

Severity: high (CVSS 8.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.5% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-07-13 · updated 2026-10-24
Weakness: CWE-284

Description

Cockpit CMS contains a missing authorization vulnerability in the Bucket file storage API (/system/buckets/api). The api() method in modules/System/Controller/Buckets.php executes bucket commands (ls, upload, removefiles, rename, createfolder) without performing any ACL or role check. Any authenticated user, regardless of role, can perform all bucket operations on any named bucket, including buckets intended for admin use only.

Affected products

Cockpit HQ Cockpit CMS: all versions

References

https://gist.github.com/sermikr0/821c4edd3c34e98a62a50b07707785bd
https://github.com/Cockpit-HQ/Cockpit/commit/dde2d1d74f5f4e11de42a298918ea8c9684f932c
https://github.com/cockpit-hq/cockpit
https://www.vulncheck.com/advisories/cockpit-cms-missing-authorization-in-bucket-file-storage-api
https://gist.github.com/sermikr0/821c4edd3c34e98a62a50b07707785bd

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